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Fix compile on older versions of GCC and CLANG (#427)

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Older versions of GCC (<4.9) and LLVM (<3.6) do not have __atomic_load_n
which is part of the C11 standard.  Fix by falling back to
__sync_fetch_and_add with a value of 0 when __atomic_load_n is not
available.

Fixes #423

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
This commit is contained in:
Rob Donnelly 2019-08-15 09:50:58 -07:00 • committed by Max Brunsfeld
parent 5e04daf483
commit 123dcfaec5
1 changed files with 4 additions and 0 deletions
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4
lib/src/atomic.h
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@ -22,7 +22,11 @@ static inline uint32_t atomic_dec(volatile uint32_t *p) {
#else
static inline size_t atomic_load(const volatile size_t *p) {
#ifdef __ATOMIC_RELAXED
return __atomic_load_n(p, __ATOMIC_RELAXED);
#else
return __sync_fetch_and_add((volatile size_t *)p, 0);
#endif
}
static inline uint32_t atomic_inc(volatile uint32_t *p) {